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A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 450 W from the surroundings. Determine
(a) the quality of the refrigerant at the evaporator inlet,
(b) the refrigeration load,
(c) the COP of the refrigerator, and
(d) the theoretical maximum refrigeration load for the same power input to the compressor.
An ideal Sterling cycle operates between thermal energy reservoirs at 27 degrees C and 527 degrees C. The maximum cycle pressure is 2000 kPa.
Determine the dimensions of the box that will minimise thecosts of materials.Based on material costs alone,how many bins canthe manufacturer produce?
How would I graph the bending moment? There is a uniformly distributed load throughout the whole beam and a 3kN force at 1.5m from A (start of the beam)and 3m from A.
A company manufactures a brand of light bulbs with a lifetime in month that is normally distribute with a mean=3 and a variance=1. A consumer buys a number of these bulbs with the intention of replacing them successively as they burn out.
two straight sections of freeway cross at a right angle. at the point of crossing the east-west highway is at elevation
assume you are an observer standing at a point on the track for a period of 30 minutes and are recording the instantaneous speed of each vehicle as it crosses your point. what is the time-mean speed and space-mean speed for these vehicles for this..
Estimate the required surface area (A), and the diameter and the depth of the tank.
A Pelton wheel, located at an elevation of 200.0 m, is used to extract power from a reservoir at an elevation of 800 m. A penstock 1500 m long and 0.8 m in diameter connects the reservoir with the nozzle of the Pelton wheel.
What information should be collected during a solid waste sort? What is a Pareto analysis and how does it apply to solid waste management?
Assuming that the new mill can be scaled to the existing 9ft x 9ftmill and that the length of the new mill is to be equal to itsdiameter, calculate the dimensions of the new mill. Round offfractional mill dimensions exceeding .2ft to the next higher ..
A car starts from rest and moves along straight line with anacceleration of a = (3s-1/3)m/s2, where s is in meters. Determine the car'svelocity and position when t = 6s
Heat is transferred to the water such that the temperature in the tank remains constant. Determine the amount of heat that must be transferred by the time one half of the total mass has been withdrawn.
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